Electron device



Aug. 27, 1929. G. T. THURNEYSSEN 1,725,945

I ELECTRON DEVICE Filed March 17, 1925 INVENTOR GUY THEODORE THURNEYSSEN ATTORNEY Patented Aug. 27, 1929.

UNITED STATES GUY THEODORE THURNEYSSEN, OltPABIB, FRANCE.

ELECTRON DEVICE.

Application filed March 17, 1925, Serial No. 18,115, and in France June 2, 1924.

My invention relates to improvements in vacuum-tube electron devices and to methods of manufacturing the same.

One of the principal objects of my mvention is the provision of an electron device having structural characteristics facllltatmg the employment of a mcthod of assembly of the various parts of the device for efi'ecting easy and accurate centering of the various electrodes before sealing.

Other objects and advantages of my 1nvention will be apparent from the follow ing description taken in conjunction with the following drawing in wluch:

The single figure is a view partly in elevation and partly in section of a preferred modification of my invention.

Referring to the figure, a metall c conducting tube 1 has a metallic conducting rod 2 mounted therein by means of circular annular securing members 3, the longitudinal axes of the tube and rod coinciding with each other. An insulated welded joint is made between the two lower extremities of the tube and rod by means of annular memher 3 in accordance with the methods described in French Patent N 0. 559,864 to VVeintraub and patents and additions thereto granted to the Society Alsacienne de Construct-ion Mecanique.

The tube 1 has an outwardly and upwardly extending metal petticoat 4 secured to a lower portion of its outer periphery by welding or brazing or any other suitable method.

A grid supporting and enclosing glass tube 5 comprises an upwardly extending tubular extension 6 and a downwardly extending overlapping tubular extension 7 terminating in an outwardly extendig peripheral portion 8 provided for a purpose to be hereinafter described. The diameter of extension 7 is greater than that of extension 6, the longitudinal vertical axes of the two extensions being coincident. The extension 6 is hermetically secured to the inner walls of the pettieoat 4 in a manner similar to that described in my French application No. 17 9,- 481 filed October 27, 1923, and addition No. 18,441 thereto filed April 2, 1924 and m French application No. 186,609 filed April 10, 1924:.

The filament 9 has one of its terminals secured to the rod 2 by means of the supporting andconducting member 10 and its other terminal secured to the tube 1 by means of the supporting and conducting member 11.

The filament 9 is thus supported in its operative positions by rod 2 and tube 1.

The cylindrical grid element 12, symmetrically arranged with respect to the filament 9, is su ported around the filament by means of con ucting rods 13 and associated clamping collars 14 frictionally engaging portions of the outer periphery of the downwardly extending tubular extension 7 as shown.

A cup shaped enclosing cylindrical metallic plate element 15 terminates at its lower end in an outwardly extending flaring portion 16. An enclosing cylindrical glass casing 17 comprising an upper portion 18 of comparatively small diameter, an intermediate portion 19 of comparatively large diameter and a lower portion 20 of comparatively small diameter is provided. The upper portion 18 is hermetically sealed within the flaring portion 16 preferably in the manner described in the above mentioned French applications and the additions thereto, the vertical longitudinal axis of plate element 15 and the enclosing member 17 coinciding.

That part of the device comprising parts, 1, 2, 3, 4, 5, 9, 10, 11, 12, 13 and 14 are assembled together as shown and described above; while parts 15 and 17 are assembled together as shown and described above. These two assemblages of parts are now ready for incorporation in a single electron device, which is preferably accomplished by a sealing machine having two rotary supports rotatable around a common axis.

One assemblage of parts is properly positioned and secured in one of the supports by means of tube 1, while the other assemblage of parts is positioned and secured in the other support by means of the plate element 15. The two supports are now moved toward each other to bring the two assemblages together the portions 8 and 20 being brought in contact with each. other and welded together as shown. This method of assembly insures the proper centering and positioning of the various electrodes of the device with relation to each other and the other parts of the device. The device is now exhausted in a well known manner through a tube 21 which is then sealed off as shown. The leads to the various electrodes may be brought out in any of the well known ways.

While I have shown and'described a preferred modification of my invention I dov not limit myself to the same; but may em" ploy such other modifications as come within the spirit and scope of my invention.

Having described my invention, what I claim is 1. In an electron emission device the combination of a filament, a conducting tube including a etticoat, a conducting rod enclosed in said tube and insulated therefrom, supporting and conducting members attached to both said tube and rod and supporting the two ends of the filament, an insulating supporting and enclosing tube having an extension secured to said etticoat and enclosing said conducting tu e, a grid support mounted on said supportin and enclosing member, a cylindrical gri element mounted on said grid support and surrounding said filament, a casing welded to said su porting and enclosing member at one end t ereof and enclosing said member, and a cylindrical plate member surrounding said filament and grid members. and having a flared end portion, which is secured to the other end of said casing, completing the enclosure of all of said elements and permitting the evacuation of air.

2. In an electron emission device the combination of an evacuated enclosure composed ofa cylindrical plate, an insulatin casing, and an insulating su porting and enclosing tube, the latter member serving to support a 'd element within and concentrlc to sai plate element, and a conducting tube havin enclosed therein a conducting rod, the tuie and rod serving to support, and conduct current to, a filament arranged within said grid element.

3. In an electron emission device, the combination of an assembly composed of grid and filament elements, their supporting and conducting members and enclosure member, said filament supporting and conducting members compr sing a hollow conducting tube and a conducting rod disposed centrallj' of and insulated from said tube, said tube and rod extending through said enclosure member, and an assembl composed of a hollow cylindrical plate e ement and a casing secured to one end thereof, said plate element serving to complete an evacuated enclosure.

GUY THEODORE THURNEYSSEN. 

